import bus from "@common/components/common/bus";

const resizeDragDialog = (vnode) => {
    let dragDialogs = window.dragDialogs;
    if (!dragDialogs) {
        dragDialogs = [];
    }
    let container = vnode.context.getActiveTabsContainer();
    let winHeight = $(container).height();
    dragDialogs.forEach(el => {
        let dialogBody = $(el).find('.el-dialog__body');
        let dialogBodyHeight = dialogBody.outerHeight();
        if (dialogBodyHeight) {
            let dialogMarginTop = $(el).find('.el-dialog').css('marginTop');
            if (dialogMarginTop) {
                dialogMarginTop = Number(dialogMarginTop.replace('px', ''));
            }
            if (dialogBodyHeight && dialogBodyHeight + dialogMarginTop > winHeight * 0.9) {
                $(el).addClass('above_dialog');
            } else {
                $(el).removeClass('above_dialog');
            }
        }
    });
};
/**
 * 弹窗拖拽指令
 */
export default {
    inserted(el, binding, vnode) {
        if (!binding.value) {
            let dragDialogs = window.dragDialogs;
            if (!dragDialogs) {
                dragDialogs = [];
            }
            dragDialogs.push(el);
            window.dragDialogs = dragDialogs;
            $(el).addClass('above_dialog');
            bus.$off('updateDragDialog').$on('updateDragDialog', () => {
                resizeDragDialog(vnode);
            });
        }
    },
    componentUpdated(el, binding, vnode) {
        if (!binding.value) {
            $(el).removeClass('above_dialog');
            vnode.context.$nextTick(() => {
                resizeDragDialog(vnode);
            });
        }
    },
    bind(el, binding) {
        // if (binding.value) {
        //     return;
        // }
        const dialogHeaderEl = el.querySelector('.el-dialog__header');
        const dragDom = el.querySelector('.el-dialog');
        dialogHeaderEl.style.cssText += ';cursor:move;';
        dragDom.style.cssText += ';top:0px;';
        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
        const sty = (() => {
            if (window.document.currentStyle) {
                return (dom, attr) => dom.currentStyle[attr];
            } else {
                return (dom, attr) => getComputedStyle(dom, false)[attr];
            }
        })();
        dialogHeaderEl.onmousedown = (e) => {
            // 鼠标按下，计算当前元素距离可视区的距离
            const disX = e.clientX - dialogHeaderEl.offsetLeft;
            const disY = e.clientY - dialogHeaderEl.offsetTop;
            const screenWidth = document.body.clientWidth; // body当前宽度
            const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
            const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
            const dragDomheight = dragDom.offsetHeight; // 对话框高度
            const minDragDomLeft = dragDom.offsetLeft;
            const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
            const minDragDomTop = dragDom.offsetTop;
            const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
            // 获取到的值带px 正则匹配替换
            let styL = sty(dragDom, 'left');
            let styT = sty(dragDom, 'top');
            // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
            if (styL.includes('%')) {
                styL = +document.body.clientWidth * (+styL.replace(/%/g, '') / 100);
                styT = +document.body.clientHeight * (+styT.replace(/%/g, '') / 100);
            } else {
                styL = +styL.replace(/px/g, '');
                styT = +styT.replace(/px/g, '');
            }
            document.onmousemove = function (e) {
                // 通过事件委托，计算移动的距离
                let left = e.clientX - disX;
                let top = e.clientY - disY;
                // 边界处理
                if (-(left) > minDragDomLeft) {
                    left = -(minDragDomLeft);
                } else if (left > maxDragDomLeft) {
                    left = maxDragDomLeft;
                }
                if (-(top) > minDragDomTop) {
                    top = -(minDragDomTop);
                } else if (top > maxDragDomTop) {
                    top = maxDragDomTop;
                }
                // 移动当前元素
                dragDom.style.cssText += `;left:${ left + styL }px;top:${ top + styT }px;`;
            };
            document.onmouseup = function (e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }
    }
};
